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Side by Side Diff: mojo/system/constants.h

Issue 621153003: Move mojo edk into mojo/edk (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: fix checkdeps Created 6 years, 2 months ago
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1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef MOJO_SYSTEM_CONSTANTS_H_
6 #define MOJO_SYSTEM_CONSTANTS_H_
7
8 #include <stddef.h>
9
10 namespace mojo {
11 namespace system {
12
13 // Maximum number of open (Mojo) handles.
14 // TODO(vtl): This doesn't count "live" handles, some of which may live in
15 // messages.
16 const size_t kMaxHandleTableSize = 1000000;
17
18 // Maximum number of active memory mappings.
19 const size_t kMaxMappingTableSize = 1000000;
20
21 const size_t kMaxWaitManyNumHandles = kMaxHandleTableSize;
22
23 const size_t kMaxMessageNumBytes = 4 * 1024 * 1024;
24
25 const size_t kMaxMessageNumHandles = 10000;
26
27 // Maximum capacity of a data pipe, in bytes. This value must fit into a
28 // |uint32_t|.
29 // WARNING: If you bump it closer to 2^32, you must audit all the code to check
30 // that we don't overflow (2^31 would definitely be risky; up to 2^30 is
31 // probably okay).
32 const size_t kMaxDataPipeCapacityBytes = 256 * 1024 * 1024; // 256 MB.
33
34 const size_t kDefaultDataPipeCapacityBytes = 1024 * 1024; // 1 MB.
35
36 // Alignment for the "start" of the data buffer used by data pipes. (The
37 // alignment of elements will depend on this and the element size.)
38 const size_t kDataPipeBufferAlignmentBytes = 16;
39
40 // TODO(vtl): Set this hard limit appropriately (e.g., higher on 64-bit). (This
41 // will also entail some auditing to make sure I'm not messing up my checks
42 // anywhere.)
43 const size_t kMaxSharedMemoryNumBytes = 1024 * 1024 * 1024; // 1 GB.
44
45 } // namespace system
46 } // namespace mojo
47
48 #endif // MOJO_SYSTEM_CONSTANTS_H_
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